No puzzle looks simpler than a Sudoku. But behind the very few rules of
this game hides enormous complexity. It’s now proved that
there are 6670903752021072936960 different grids for a standard
9×9 Sudoku. More refinements and subtleties taking
symmetries into account have been examined as well as other
variants of Sudoku. Solving strategies have been studied
inside out, enumerated and refined. Sudoku grids and
…

I am preparing a series of posts related to Sudoku. I am
revisiting the “SQL only” solution I posted somewhere else a long
time ago… This time, we’ll get serious and optimize
everything we can! This lemon will be squeezed to the
maximum!

Start your Pharo image (not mandatory since I will provide all
necessary SQL scripts) and MySQL server as we’ll try to solve
some Sudoku puzzles only with one SQL statement
(no stored procedures or functions)!

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